Revert "sched: Fix race in task_group()"

This reverts commit 78bba95fc2633ad38d1f348a45eaa1d8b40c0b7e.
Revert "ARM: OMAP2+: OPP: Fix cherry-pick"

This reverts commit 13293f1cf9a1d1c2e62af716b310e5acc415cbde.
Revert "ARM: OMAP2+: OPP: Fix to ensure check of right oppdef after bad one"

This reverts commit 06526900a3377c6de50dbbbbb5ccdb0b12e33760.